EP0015960B1 - Stator envelope for air-cooled electric machine - Google Patents

Stator envelope for air-cooled electric machine Download PDF

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Publication number
EP0015960B1
EP0015960B1 EP79900442A EP79900442A EP0015960B1 EP 0015960 B1 EP0015960 B1 EP 0015960B1 EP 79900442 A EP79900442 A EP 79900442A EP 79900442 A EP79900442 A EP 79900442A EP 0015960 B1 EP0015960 B1 EP 0015960B1
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EP
European Patent Office
Prior art keywords
stator core
stator
sheet metal
metal jacket
barrel
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP79900442A
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German (de)
French (fr)
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EP0015960A1 (en
Inventor
Albert Meier
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zschokke Wartmann AG
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Zschokke Wartmann AG
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Publication date
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Publication of EP0015960A1 publication Critical patent/EP0015960A1/en
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Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
    • H02K15/14—Casings; Enclosures; Supports
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B4/00—Shrinkage connections, e.g. assembled with the parts at different temperature; Force fits; Non-releasable friction-grip fastenings
    • F16B4/004—Press fits, force fits, interference fits, i.e. fits without heat or chemical treatment
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/18—Casings or enclosures characterised by the shape, form or construction thereof with ribs or fins for improving heat transfer
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49009—Dynamoelectric machine

Definitions

  • the invention relates to a stator housing for an air-cooled electrical machine, which consists of a sheet metal jacket intended for seating on a stator core with a number of integrally formed, axially extending, radially projecting cooling fins spaced apart from one another in the circumferential direction.
  • a stator housing for air-cooled electrical machines is known (DE-A-22 26 554), of which one embodiment has a smaller inner diameter than the outer circumference and is therefore expanded when it is applied to the stator core. So that a full connection between the stator housing and the stator core can be achieved, but since the ends of the stator housing protrude considerably above the stator core and thus remain essentially unchanged in diameter, the jacket of the stator housing is only expanded in the middle. This creates a barrel-like deformation of the jacket housing, so that a full support of the jacket is only guaranteed at the edges of the stand package.
  • the invention has for its object to design a stator housing of the type described in such a way that when the stator housing is pressed onto the stator core, a uniform, full support is achieved over the entire area of contact between the stator housing and core.
  • This is achieved according to the invention in that the inner lateral surface of the sheet metal jacket is formed in the axial direction before being seated on the stator core as a convex surface, the inside diameter of which corresponds to the outside diameter of the stator core at both ends of the sheet metal jacket, and the sheet metal jacket at both ends of the expansion the front-side jacket diameter which prevents stiffening known per se when the stator core is pressed in.
  • the convex design of the stator housing causes a preload which, when the stator core is pressed in, ensures that a sufficient contact pressure, practically uniformly distributed over the entire area of the contact area, is exerted by the stator housing on the stator core.
  • the stiffeners near the edge which prevent the inner edge diameter of the stator housing from expanding when the stator core is pressed in, can be outer and / or inner support rings, which then close to the edge with the sheet metal jacket, eg. B. are connected with welds.
  • stiffeners it is also possible for the stiffeners to be formed by weld connections near the edge at the base of the cooling fins.
  • the invention relates to an air-cooled electrical machine with a stator housing according to the invention, in which the inner jacket surface of the sheet metal jacket with the jacket sections lying between the cooling fins sits uniformly firmly on the peripheral surface of the stator core.
  • a preferred embodiment consists in that an axially extending, non-rotatably arranged wedge is provided between the sheet metal jacket and the stator core.
  • the machine feet can expediently be supported on a part of the stator housing which bears against the stator core and can be at least partially welded to the stator core with this part.
  • the invention further relates to a method for producing the machine according to the invention, in which the sheet metal jacket is provided with stiffening flanges and the stator core is then pressed into the sheet metal jacket.
  • stator housing 1 schematically shows an arrangement of a stator housing 1 with a stator core 2, as this arrangement is used for the stator of an air-cooled electrical machine, for example according to the embodiments illustrated in FIGS. 3 and 4, the stator being constructed by a foot construction 15 is supported on the foundation.
  • the stator housing 1 is formed from a sheet metal jacket with a plurality of integrally formed, axially extending, radially projecting cooling ribs 6 and 6 'spaced apart from one another in the circumferential direction, with certain cladding sections 7 and 7 'being located between the cooling fins to rest on the surface of the stator core, as will be explained in more detail below.
  • the cooling fins 6 can be open (Fig. 3) or closed (6 ') (Fig. 4), as is well known and practiced.
  • stator housing 1 and stator core 2 For the assembly of stator housing 1 and stator core 2, the latter is pressed into the preformed stator housing 1 (FIG. 1b).
  • the inner lateral surface 3 of the sheet metal jacket 1 is configured convexly in the axial direction, the inner edge diameter at both ends of the sheet metal jacket 1 corresponding to the outer diameter of the stator core 2.
  • the sheet metal jacket 1 is provided at both ends with reinforcements to be described in more detail below, which prevent the stator core 2 from being widened when the stator core 2 is pressed into the sheet metal jacket.
  • the preformed stator housing 1 thus has a pretension such that when pressed on, the inner lateral surface of the jacket parts 7 lying between the cooling fins 6 lies absolutely uniformly and firmly with a predetermined contact pressure over their entire surface area on the surface of the stator core 2, as a result of which the set areas Requirements for heat transfer capability and snapshot are met.
  • this technique described above allows disassembly and reassembly between stator housing 1 and stator core 2.
  • the stiffeners mentioned can be welding points 16 near the edge at the base or over the entire height of the cooling fins 6.
  • the stiffeners are formed by an outer support ring 4 and an inner support ring 5, whereby of course either two outer or two inner support rings could also be used. These support rings also serve as supports for the end shields of the machine (not shown).
  • stator housing described above is generally preformed from a metal sheet, the cooling fins being stamped or. Stamping tools are machined. By appropriately crowning these tools, it is now possible to produce the convexity of the inner lateral surface described above in the same operation.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Motor Or Generator Frames (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)
  • Motor Or Generator Cooling System (AREA)

Abstract

The stator envelope (1) for air-cooled electric machine comprises a sheet iron barrel (1) designed for being applied onto the stator core (2) and so shaped as to have a plurality of cooling fins (6) extending axially, projecting radially and spaced from each other in a peripheral direction. Furthermore, the inner surface (3) of the sheet iron barrel (1) has a convex shape in the axial direction and the inner diameters of the edges at both ends of the barrel correspond, preferably, to the outer diameter of the stator core (2). Moreover, the sheet iron barrel (1) has at both ends reinforcing elements (16) for preventing the diameters of the edges from increasing when the stator core is pressed inside the barrel. The arrangement is such that, during pressing, the inner surface (3) of the parts of the barrel forming the stator envelope (1) and between the cooling blades (6), is firmly and uniformly applied along all of its length on the stator core (2) in a manner such that the stator envelope (1) and core (2) form a unit block, at least as regards to heat transmission and mechanical forces.

Description

Die Erfindung betrifft ein Statorgehäuse für eine luftgekühlte elektrische Maschine, das aus einem zum Aufsitzen auf einem Statorkern bestimmten Blechmantel mit einer Anzahl angeformter, sich axial erstreckender, radial abragender und in Umfangsrichtung voneinander distanzierter Kühlrippen besteht.The invention relates to a stator housing for an air-cooled electrical machine, which consists of a sheet metal jacket intended for seating on a stator core with a number of integrally formed, axially extending, radially projecting cooling fins spaced apart from one another in the circumferential direction.

Es ist ein Statorgehäuse für luftgekühlte elektrische Maschinen bekannt (DE-A-22 26 554), von dem eine Ausführungsform einen kleineren Innendurchmesser aufweist als der Aussenumfang und deshalb beim Aufbringen auf den Statorkern aufgeweitet wird. Damit kann zwar eine satte Verbindung zwischen dem Statorgehäuse und dem Ständerpaket erreicht werden, da aber die Enden des Statorgehäuses erheblich über das Ständerpaket ragen und damit in ihrem Durchmesser im wesentlichen unverändert bleiben, wird der Mantel des Statorgehäuses nur in der Mitte aufgeweitet. Es entsteht somit eine tonnenartige Verformung des Mantelgehäuses, so dass eine satte Auflage des Mantels nur an den Rändern des Ständerpaketes gewährleistet ist.A stator housing for air-cooled electrical machines is known (DE-A-22 26 554), of which one embodiment has a smaller inner diameter than the outer circumference and is therefore expanded when it is applied to the stator core. So that a full connection between the stator housing and the stator core can be achieved, but since the ends of the stator housing protrude considerably above the stator core and thus remain essentially unchanged in diameter, the jacket of the stator housing is only expanded in the middle. This creates a barrel-like deformation of the jacket housing, so that a full support of the jacket is only guaranteed at the edges of the stand package.

Der Erfindung liegt die Aufgabe zugrunde, ein Statorgehäuse der eingangs beschriebenen Art so auszugestalten, dass beim Aufpressen des Statorgehäuses auf den Statorkern eine gleichmässige, satte Auflage über dem gesamten Berührungsflächenbereich zwischen Statorgehäuse und -kern erreicht wird. Dies wird gemäss der Erfindung dadurch gelöst, dass die innere Mantelfläche des Blechmantels vor dem Aufsitzen auf dem Statorkern in axialer Richtung als konvexe Fläche ausgebildet ist, deren Innendurchmesser an beiden Enden des Blechmantels dem Aussendurchmesser des Statorkerns entsprechen, und der Blechmantel an beiden Enden das Aufweiten der stirnseitigen Manteldurchmesser beim Einpressen des Statorkerns verhindernde, an sich bekannte Versteifungen aufweist.The invention has for its object to design a stator housing of the type described in such a way that when the stator housing is pressed onto the stator core, a uniform, full support is achieved over the entire area of contact between the stator housing and core. This is achieved according to the invention in that the inner lateral surface of the sheet metal jacket is formed in the axial direction before being seated on the stator core as a convex surface, the inside diameter of which corresponds to the outside diameter of the stator core at both ends of the sheet metal jacket, and the sheet metal jacket at both ends of the expansion the front-side jacket diameter which prevents stiffening known per se when the stator core is pressed in.

Durch diese Massnahmen ist es nunmehr möglich, dass dann bei eingepresstem Statorkern im Statorgehäuse die innere Mantelfläche der zwischen den Kühlrippen liegenden Mantelpartien des Statorgehäuses derart gleichmässig fest über ihre ganze Flächenausdehnung auf dem Statorkern aufsitzt, dass Statorgehäuse und Statorkern praktisch eine Einheit bilden, bei welcher eine optimale Wärmeübertragung gewährleistet ist und das Statorgehäuse die Forderung nach Selbsttragefähigkeit voll erfüllt.Through these measures it is now possible that when the stator core is pressed into the stator housing, the inner lateral surface of the jacket parts of the stator housing lying between the cooling ribs is seated on the stator core so uniformly and firmly over its entire surface area that the stator housing and stator core practically form a unit, in which one optimal heat transfer is guaranteed and the stator housing fully meets the requirement for self-sustainability.

Die konvexe Ausgestaltung des Statorgehäuses bewirkt dabei eine Vorspannung, die beim Einpressen des Statorkerns dafür sorgt, dass ein genügender praktisch gleichmässig über die ganze Berühungsflächenausdehnung verteilter Anpressdruck vom Statorgehäuse auf den Statorkern ausgeübt wird.The convex design of the stator housing causes a preload which, when the stator core is pressed in, ensures that a sufficient contact pressure, practically uniformly distributed over the entire area of the contact area, is exerted by the stator housing on the stator core.

Die randnahen, ein Aufweiten der inneren Randdurchmesser des Statorgehäuses beim Einpressen des Statorkerns verhindernden Versteifungen können dabei äussere und/oder innere Stützringe sein, welche dann randnahe mit dem Blechmantel, z. B. mit Schweissungen, verbunden sind.The stiffeners near the edge, which prevent the inner edge diameter of the stator housing from expanding when the stator core is pressed in, can be outer and / or inner support rings, which then close to the edge with the sheet metal jacket, eg. B. are connected with welds.

Es ist aber auch möglich, dass die Versteifungen durch randnahe Schweissverbindungen an der Basis der Kühlrippen gebildet sind.However, it is also possible for the stiffeners to be formed by weld connections near the edge at the base of the cooling fins.

Ferner betrifft die Erfindung eine luftgekühlte elektrische Maschine mit einem erfindungsgemässen Statorgehäuse, bei dem die innere Mantelfläche des Blechmantels mit den zwischen den Kühlrippen liegenden Mantelpartien gleichmässig fest auf der Umfangsfläche des Statorkerns aufsitzt.Furthermore, the invention relates to an air-cooled electrical machine with a stator housing according to the invention, in which the inner jacket surface of the sheet metal jacket with the jacket sections lying between the cooling fins sits uniformly firmly on the peripheral surface of the stator core.

Eine vorzugsweise Ausgestaltung besteht darin, dass zwischen dem Blechmantel und dem Statorkern ein sich axial erstreckender, drehfest angeordneter Keil vorgesehen ist.A preferred embodiment consists in that an axially extending, non-rotatably arranged wedge is provided between the sheet metal jacket and the stator core.

Zweckmässig können die Maschinenfüsse an einem am Statorkern anliegenden Teil des Statorgehäuses abgestützt und mit diesem Teil mindestens teilweise mit dem Statorkern verschweisst sein.The machine feet can expediently be supported on a part of the stator housing which bears against the stator core and can be at least partially welded to the stator core with this part.

Weiter betrifft die Erfindung ein Verfahren zur Herstellung der erfindungsgemässen Maschine, bei dem der Blechmantel mit Versteifungsflanschen versehen und anschliessend der Statorkern in den Blechmantel eingepresst wird.The invention further relates to a method for producing the machine according to the invention, in which the sheet metal jacket is provided with stiffening flanges and the stator core is then pressed into the sheet metal jacket.

Beispielsweise Ausführungsformen des Erfindungsgegenstandes werden nachfolgend anhand der Zeichnung näher erläutert.For example, embodiments of the subject matter of the invention are explained in more detail below with reference to the drawing.

Es zeigen :

  • Figur 1a ein Statorgehäuse mit einem Stator, im Axialschnitt ;
  • Figur 1 getrennt ein Statorgehäuse und einen Stator, im Axialschnitt ;
  • Figur 2 ein Statorgehäuse mit Stützringen, im Axialschnitt ;
  • Figuren 3 und 4 Stirnansichten von zwei unterschiedlichen Ausführungsformen von Statoranordnungen einer luftgekühlten elektrischen Maschine ;
  • Figur 5 ausschnittweise eine Fusskonstruktion an einer Statorgehäuse- und kernanordnung ; und
  • Figuren 6, 7 und 8 ausschnittweise Ausführungsvarianten von Keilverbindungen zwischen einem Statorgehäuse und einem Statorkern.
Show it :
  • Figure 1a shows a stator housing with a stator, in axial section;
  • Figure 1 separately a stator housing and a stator, in axial section;
  • Figure 2 shows a stator housing with support rings, in axial section;
  • FIGS. 3 and 4 end views of two different embodiments of stator arrangements of an air-cooled electrical machine;
  • FIG. 5 a section of a foot construction on a stator housing and core arrangement; and
  • Figures 6, 7 and 8 detail versions of wedge connections between a stator housing and a stator core.

Aus der Fig. 1a geht schematisch eine Anordnung eines Statorgehäuses 1 mit einem Statorkern 2 hervor, wie diese Anordnung für den Stator einer luftgekühlten elektrischen Maschine, etwa gemäss den in Fig. 3 und 4 veranschaulichten Ausführungsformen, Verwendung findet, wobei der Stator durch eine Fusskonstruktion 15 auf dem Fundament abgestützt ist. Aus den Fig. 3 und 4 geht ferner hervor, dass das Statorgehäuse 1 aus einem Blechmantel mit einer Mehrzahl angeformter, sich axial erstreckender, radial abstehender und in Umfangsrichtung voneinander distanzierter Kühlrippen 6 bzw. 6' gebildet ist, wobei sich zwischen den Kühlrippen zur Anlage auf der Oberfläche des Statorkerns bestimmte Mantelpartien 7 bzw. 7' befinden, wie das im Einzelnen noch näher erläutert wird. Die Kühlrippen 6 können von offener Form (Fig. 3) oder von geschlossener (6') Form (Fig. 4) sein, wie dies allgemein bekannt ist und praktiziert wird.1a schematically shows an arrangement of a stator housing 1 with a stator core 2, as this arrangement is used for the stator of an air-cooled electrical machine, for example according to the embodiments illustrated in FIGS. 3 and 4, the stator being constructed by a foot construction 15 is supported on the foundation. 3 and 4 also show that the stator housing 1 is formed from a sheet metal jacket with a plurality of integrally formed, axially extending, radially projecting cooling ribs 6 and 6 'spaced apart from one another in the circumferential direction, with certain cladding sections 7 and 7 'being located between the cooling fins to rest on the surface of the stator core, as will be explained in more detail below. The cooling fins 6 can be open (Fig. 3) or closed (6 ') (Fig. 4), as is well known and practiced.

Für die Montage von Statorgehäuse 1 und Statorkern 2 wird letzterer in das vorgeformte Statorgehäuse 1 eingepresst (Fig. 1b). Erfindungsgemäss ist hierfür die innere Mantelfläche 3 des Blechmantels 1 in axialer Richtung konvex ausgestaltet, wobei die inneren Randdurchmesser an beiden Enden des Blechmantels 1 dem Aussendurchmesser des Statorkerns 2 entsprechen. Hierbei ist der Blechmantel 1 an beiden Enden mit nachfolgend noch näher zu bezeichnenden Versteifungen versehen, welche beim Einpressen des Statorkerns 2 in den Blechmantel 1 ein Aufweiten dessen Randdurchmesser verhindern. Das vorgeformte Statorgehäuse 1 besitzt somit eine Vorspannung derart, dass sich beim Aufpressen die innere Mantelfläche der zwischen den Kühlrippen 6 liegenden Mantelpartien 7 absolut gleichmässig und fest mit vorgegebenem Anpressdruck über deren gesamte Flächenausdehnung an die Oberfläche des Statorkerns 2 anlegt, wodurch in vorgegebenem Masse die gestellten Anforderungen an Wärme- übertragungsfähigkeit und Momentaufnahme erfüllt werden. Zudem gestattet diese vorbeschriebene Technik eine De- und Wiedermontage zwischen Statorgehäuse 1 und Statorkern 2.For the assembly of stator housing 1 and stator core 2, the latter is pressed into the preformed stator housing 1 (FIG. 1b). According to the invention, the inner lateral surface 3 of the sheet metal jacket 1 is configured convexly in the axial direction, the inner edge diameter at both ends of the sheet metal jacket 1 corresponding to the outer diameter of the stator core 2. Here, the sheet metal jacket 1 is provided at both ends with reinforcements to be described in more detail below, which prevent the stator core 2 from being widened when the stator core 2 is pressed into the sheet metal jacket. The preformed stator housing 1 thus has a pretension such that when pressed on, the inner lateral surface of the jacket parts 7 lying between the cooling fins 6 lies absolutely uniformly and firmly with a predetermined contact pressure over their entire surface area on the surface of the stator core 2, as a result of which the set areas Requirements for heat transfer capability and snapshot are met. In addition, this technique described above allows disassembly and reassembly between stator housing 1 and stator core 2.

Die genannten Versteifungen können gemäss Fig. 1b randnahe Schweisspunkte 16 an der Basis oder über die ganze Höhe der Kühlrippen 6 sein. Gemäss Fig. 2 werden die Versteifungen durch einen äusseren Stützring 4 und einen inneren Stützring 5 gebildet, wobei natürlich auch entweder zwei äussere oder zwei innere Stützringe Verwendung finden könnten. Diese Stützringe dienen gleichzeitig als Träger der Lagerschilder der Maschine (nicht dargestellt).According to FIG. 1 b, the stiffeners mentioned can be welding points 16 near the edge at the base or over the entire height of the cooling fins 6. 2, the stiffeners are formed by an outer support ring 4 and an inner support ring 5, whereby of course either two outer or two inner support rings could also be used. These support rings also serve as supports for the end shields of the machine (not shown).

Fig. 5 zeigt nun, dass zur Anbringung der Fusskonstruktion 15 zweckmässig eine Kühlrippe am Umfang des Statorgehäuses 1 ausgelassen und dort der Maschinenfuss zweckmässig durch das Statorgehäuse 1 hindurch mit dem Statorkern 2 verschweisst. Dies bildet natürlich nur eine von einer ganzen Reihe von Möglichkeiten der Ausgestaltung und Anbringung von Fusskonstruktionen.5 now shows that a cooling fin is expediently omitted on the circumference of the stator housing 1 for attaching the foot construction 15 and the machine foot there is expediently welded to the stator core 2 through the stator housing 1. Of course, this is only one of a whole series of options for designing and attaching foot constructions.

Für grössere Maschinen ist es oft zweckmässig, zwischen Statorgehäuse 1 und Statorkern 2 eine zusätzliche, sich axial erstreckende Keilverbindung vorzusehen zur Herstellung einer Formschlüssigkeit in Umfangsrichtung. In den Fig. 6, 7 und 8 sind solche Verbindungen veranschaulicht. Bei der Anordnung gemäss Fig. 6 sind am Umfang des Statorkerns 2 verteilt sich axial erstreckende Flachprofilstäbe 8 aufgeschweisst, welche dann bei der Montage in die betreffenden offenen Kühlrippen 6 eingreifen und gleichzeitig dazu dienen können, die einzelnen Blechlamellen des Statorkerns zusammenzuhalten. Diese Keilverbindung dient der axialen Führung bei der Montage und verunmöglicht Relativverdrehungen zwischen Statorgehäuse und Statorkern. Bei der Anordnung gemäss Fig. 7 hingegen greifen Flachprofilstäbe 9 sowohl in eine entsprechende Nut 17 im Statorkern 2 als auch in eine betreffende offene Kühlrippe 6 am Statorgehäuse 1 ein. Hierbei kann der Flachprofilstab 9 etwa mit der Kühlrippe 6 verschweisst sein. Bei der Anordnung gemäss Fig. 8 hingegen ragen vom Statorkern 2 Profilnocken 10 ab, welche in entsprechende Hohl-Kühlrippen 6 im Statorgehäuse 1 eingreifen.For larger machines, it is often expedient to provide an additional, axially extending wedge connection between the stator housing 1 and the stator core 2 in order to produce a positive fit in the circumferential direction. In the Fi g. 6, 7 and 8 such connections are illustrated. In the arrangement according to FIG. 6, axially extending flat profile bars 8 are welded onto the circumference of the stator core 2, which then engage in the relevant open cooling fins 6 during assembly and can simultaneously serve to hold the individual laminations of the stator core together. This wedge connection is used for axial guidance during assembly and prevents relative rotation between the stator housing and the stator core. 7, on the other hand, flat profile bars 9 engage both in a corresponding groove 17 in the stator core 2 and in an open cooling fin 6 in question on the stator housing 1. The flat profile rod 9 can be welded to the cooling fin 6, for example. In contrast, in the arrangement according to FIG. 8, profile cams 10 protrude from the stator core 2, which engage in corresponding hollow cooling fins 6 in the stator housing 1.

Das vorbeschriebene Statorgehäuse wird in der Regel aus einem Blech vorgeformt, wobei die Kühlrippen durch Stempel-bzw. Prägewerkzeuge maschinell ausgebildet werden. Durch entsprechende Bombierung dieser Werkzeuge ist es nun möglich, die vorbeschriebene Konvexität der inneren Mantelfläche im gleichen Arbeitsgang herzustellen.The stator housing described above is generally preformed from a metal sheet, the cooling fins being stamped or. Stamping tools are machined. By appropriately crowning these tools, it is now possible to produce the convexity of the inner lateral surface described above in the same operation.

Claims (7)

1. Stator casing for an air-cooled electrical machine, which comprises a sheet metal jacket to be placed on the stator core and has a plurality of integrally formed, axially extending, radially projecting and peripherally spaced cooling ribs, characterised in that the inner surface (3) of the sheet metal jacket (1) is made axially convex before mounting onto the stator core and the inner diameter at both ends of the sheet metal jacket corresponds to the outside diameter of the stator core, and at both ends the sheet metal jacket (1) has reinforcements (4, 5) known as such which prevent an enlargement of the end diameter on pressing in the stator core.
2. Stator casing according to claim 1, characterised in that the reinforcements are outer (4) and/or inner (5) thrust rings, which are connected to the sheet metal close to the edge, e. g. by welds.
3. Stator casing according to claim 1, characterised in that the reinforcements are formed by welded joints, close to the edge, on the base of the cooling rib.
4. An air-cooled electrical machine haering a stator casing according to claim 1, characterised in that the inner surface of the sheet metal jacket (1) with the jacket (7, 7') located between the cooling rib (6) is mounted uniformly and firmly on the peripheral surface of the stator core (2).
5. Machine according to claim 4, characterised in that an axially extending keyed joint (8,9,10) is provided between the sheet metal jacket (1) and the stator core (2).
6. Machine according to claim 4, characterised in that the machine supports (15) are supported on a part (7, 7') of the stator casing (1) adjacent to the stator core and are welded together with said part at least partially to the stator core (2).
7. Method for the manufacture of the machine according to claim 4, characterised in that the sheet metal jacket (1) is provided with reinforcing rings (4, 5) and subsequently the stator core is pressed into the sheet metal jacket.
EP79900442A 1978-05-03 1979-12-05 Stator envelope for air-cooled electric machine Expired EP0015960B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH4860/78 1978-05-03
CH486078A CH633392A5 (en) 1978-05-03 1978-05-03 Stator FOR A LUFTGEKUEHLTE ELECTRIC MACHINE.

Publications (2)

Publication Number Publication Date
EP0015960A1 EP0015960A1 (en) 1980-10-01
EP0015960B1 true EP0015960B1 (en) 1983-05-11

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EP79900442A Expired EP0015960B1 (en) 1978-05-03 1979-12-05 Stator envelope for air-cooled electric machine

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US (1) US4415824A (en)
EP (1) EP0015960B1 (en)
JP (1) JPS6362992B2 (en)
CH (1) CH633392A5 (en)
DE (2) DE2948823D2 (en)
GB (1) GB2037095B (en)
SE (1) SE429387B (en)
SU (1) SU1116984A3 (en)
WO (1) WO1979001024A1 (en)

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SE8000025L (en) 1980-01-02
SE429387B (en) 1983-08-29
GB2037095B (en) 1982-10-06
US4415824A (en) 1983-11-15
JPS6362992B2 (en) 1988-12-06
DE2948823C1 (en) 1988-07-07
JPS55500327A (en) 1980-06-05
EP0015960A1 (en) 1980-10-01
CH633392A5 (en) 1982-11-30
GB2037095A (en) 1980-07-02
SU1116984A3 (en) 1984-09-30
WO1979001024A1 (en) 1979-11-29
DE2948823D2 (en) 1980-11-20

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